Apple Mac Pro Intel Xeon 4Core 2, 66GHz

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Quad-core Processing
Two 2. 66GHz Dual-Core Intel Xeon 5100 series processors
Intel Core microarchitecture
4MB of shared L2 cache per processor (8MB total)
128-bit SSE3 vector engine
64-bit data paths and registers
Energy efficiency optimization
1. 33GHz, 64-bit dual independent frontside buses
Memory
1GB 667MHz DDR2 ECC fully buffered DIMM (FB-DIMM) memory
Eight FB-DIMM slots on two memory riser cards (four slots per card) supporting up to 16GB of main memory
256-bit-wide memory architecture
Graphics and displays
Double-wide, 16-lane PCI Express graphics slot with one of the following graphics cards installed:
NVIDIA GeForce 7300 GT with 256MB of GDDR2 SDRAM, one single-link DVI port, and one dual-link DVI port
ATI Radeon X1900 XT with 512MB of GDDR3 SDRAM and two dual-link DVI ports
NVIDIA Quadro FX 4500 with 512MB of GDDR3 SDRAM, two dual-link DVI ports, and one stereo 3D port
Multiple graphics card configurations including two, three, or four NVIDIA GeForce 7300 GT cards
300W for up to four PCI Express graphics cards
Support for up to eight displays1
Support for digital resolutions up to 1920 by 1200 pixels; dual-link DVI ports support up to 2560 by 1600 pixels
Support for analog resolutions up to 2048 by 1536 pixels
DVI to VGA adapter included
Dual-display support for extended desktop and video mirroring modes
Communications
Two independent 10/100/1000BASE-T Ethernet (RJ-45) interfaces with support for jumbo frames
Optional 802. 11n AirPort Extreme wireless networking2
Optional Bluetooth 2. 0 + Enhanced Data Rate (EDR) up to 3Mb/s
Optional external Apple USB Modem (RJ-11)
Storage
Four independent 3Gb/s Serial ATA cable-free, direct-attach hard drive bays; four internal hard drive carriers included
Up to 3TB of internal storage3 using hard drives in the following capacities:
Hard drive bay 1
250GB Serial ATA 3Gb/s, 7200 rpm, 8MB cache